Kattimani, S.2026-02-052021Journal of Vibration Engineering and Technologies, 2021, 9, 7, pp. 1533-155525233920https://doi.org/10.1007/s42417-021-00312-yhttps://idr.nitk.ac.in/handle/123456789/23060This paper presents the effect of piezoelectric interphase thickness on the nonlinear behavior of multiphase magneto–electro–elastic (MMEE) fibrous composite plates. A layer-wise shear deformation theory has been considered for the kinematics of the MMEE plate integrated with the principle of virtual work in a three-dimensional finite element (FE) formulation. To incorporate the effect of piezoelectric interphase thickness on the nonlinear behavior of the plate, the multiphase fibrous composite substrate considered for the evaluation is consists of carbon fibers surrounded by a thin coating of piezoelectric fiber (PZT-7A) embedded in piezomagnetic (cobalt ferrite-CoFe<inf>2</inf>O<inf>4</inf>) matrix material. The influence of piezoelectric and piezomagnetic coupled fields on the stiffness and nonlinear behavior of MMEE (CoFe<inf>2</inf>O<inf>4</inf>/PZT-7A/Carbon) composites considerably varies with PZT-7A interphase thickness. Thus, the transient response, nonlinear frequency ratio, and nonlinear deflection of the structure remarkably changes. Besides, the variation of fiber/matrix volume fraction and interphase thickness exhibits tremendous influence on the nonlinear behavior of the MMEE fibrous composite plate. Further attention has been paid to investigate the influence of boundary conditions, aspect ratio, volume fraction, and coupled fields on the nonlinear behavior of the MMEE fibrous composite plate. © 2021, Krishtel eMaging Solutions Private Limited.Interphase thicknessMagneto–electro–elasticMultiphase fibrous compositeNonlinear behaviorNonlinear frequency ratioTransient analysis